In the wake of complaints of noise pollution caused by Metro trains, the DMRC has resorted to regular greasing of tracks on sharp curves and erecting noise barriers at some locations, the government said today.

It, however, maintained that such disturbances were harmless for the residents living close to Metro lines.

“A few complaints have been received from individuals and groups,” Union Minister of State for Urban Development Mr Sougata Roy said in response to a question about noise created by Metro trains, in the Lok Sabha.